Stolen tuner xl pivotal seatpoststolens tuner xl pivotal seatpost is a 6061 alloy forged constructed post with 15mm evenly spaced light grooves that can be used as a seat height indicator once installed or as cut off guides featuresmaterial 6061 forged alloysize 25 4mm x 320mmlight grooves 15mm apartbuy stolen components from chain reaction cycles the worlds largest online bike store